| 摘要 |
The invention relates to a leak warning system for double-walled fluid lines (4) or tanks (2), in particular in filling stations (1), comprising a pressure fluid reservoir (7) for pressurising the cavity (6) of the double wall with pressure medium, a first pressure sensor (9) for measuring the cavity pressure (po), a second pressure sensor (10), for measuring the internal pressure (pi) of the fluid line (4) or tank (2), a controllable valve (8) between the pressure fluid reservoir (7) and the cavity (6), a regulator (13) connected to the pressure sensors (9, 10) for controlling the valve (7) with the regulation purpose being to hold the cavity pressure (po) at a minimum pressure difference (pdiff,min) above the internal pressure (pi) and an analytical unit (15) connected to the pressure sensors (9, 10) which gives a leak warning when the pressure difference between the cavity pressure (po) and the internal pressure (pi) exceeds the minimum pressure difference (pdiff,min). |
